We no longer carry Poly MDA220 USB - handset/computer/headset switch (4841992), but we found this replacement for you.
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The HP Poly MDA220 USB Adapter helps simplify the transition to Unified Communications (UC) by enabling the management of calls from desk phones, softphones and even mobile phones with the same headset. It is ideal for users who need to manage audio from multiple sources with a single headset and teams who require both PC and desk phone connectivity.